Luminescent material

Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides

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313486, C09K 1146

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active

041274989

ABSTRACT:
A luminescent beryllium-containing silicate activated by bivalent europium defined by the formula Me.sub.1-x Eu.sub.x Be.sub.a Si.sub.a O.sub.3a+1, in which 0.005 .ltoreq.x.ltoreq.0.20 and a has the value 1 or 2 and in which Me represents at least one of the alkaline earth metals barium, strontium and calcium. If a = 2 at least 50 gram-atomic % of Me is strontium. If a = 1 up to 25 gram.atomic % of Be together with the same quantity of Si may be replaced by an equiatomic quantity of Al.
The luminescent silicate is preferably used in mercury vapor discharge lamps.

REFERENCES:
patent: 2457054 (1948-12-01), Leverenz
patent: 3544481 (1970-12-01), Barry
patent: 3651363 (1972-03-01), Barry
patent: 3813569 (1974-05-01), Verstegen et al.
patent: 3839219 (1974-10-01), Verstegen et al.
Ito et al., "Chemical Abstracts" vol. 67, 1967, p. 15826f.
Odelevskii et al., "Chemical Abstracts", vol. 54, p. 19249i.

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